Dinuclear lanthanide(III) complexes with large-bite Schiff bases derived from 2,6-diformyl-4-chlorophenol and hydrazides: Synthesis, structural characterization and spectroscopic studies

作者：Tamboura Farba Bouyagui; Diouf Ousmane; Barry Aliou Hamady; Gaye Mohamed^*; Sall Abdou Salam

来源：Polyhedron, 2012, 43(1): 97-103.

DOI：10.1016/j.poly.2012.06.025

• Lanthanide
• Hydrazone
• Schiff bases

Two Schiff bases (H3L1 and H5L2), derived from 2,6-diformyl-4-chlorophenol and hydrazides, and their complexes with some lanthanides (V, La, Nd, Sm, Dy and Er) have been synthesized. These compounds have been characterized by means of elemental analysis, UV-Vis spectroscopy, IR spectroscopy, H-1 and C-13 NMR (for the organic ligands), molar conductance and room temperature magnetic measurements. Single crystal X-ray analysis of the two complexes [La-2(H2L1)(3)(C2H5OH)(2)]center dot(Cl)center dot(NO3)(2)((CH3)(2)CO)(2)center dot(H2O)(2) (1) and [Er-2(H4L2)(3)]center dot(SCN)(3)center dot(H2O) (8) has revealed the nature of the structures; the lanthanide(III) ions are intramolecularly bridged by three phenolic oxygen atoms, forming a dinuclear complex. The lanthanum atom is ten-coordinated, while the erbium atom is nine-coordinated. The coordination polyhedron of the erbium complex is best described as a tricapped trigonal prism.

• 出版日期2012-8-13